ICD-10-CM 2027
ICD-10 code for perinatal period infection
Infection specific to the perinatal period, unspecified
From the official ICD-10-CM alphabetic index entry “Infection, infected, infective (opportunistic) › perinatal period”. Page updated September 29, 2026.
About coding perinatal period infection
The ICD-10-CM code for perinatal period infection is P39.9 (Infection specific to the perinatal period, unspecified). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on P39.9.
Within P39, choose P39.9 (Infection specific to the perinatal period, unspecified) only when documentation doesn't support a more specific option: neonatal infective mastitis (P39.0), neonatal conjunctivitis and dacryocystitis (P39.1), Intra-amniotic infection affecting newborn, not elsewhere classified (P39.2), neonatal urinary tract infection (P39.3), neonatal skin infection (P39.4) and other specified infections specific to the perinatal period (P39.8).
Use an additional code to identify organism or specific infection.
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
More specific perinatal period infection codes (official index)
- specified type NEC P39.8 — Other specified infections specific to the perinatal period
Common questions about perinatal period infection ICD-10 codes
What is the ICD-10 code for perinatal period infection?
- P39.9 — Infection specific to the perinatal period, unspecified. More specific codes apply when the documentation supports them: P39.8.
Is P39.9 billable?
- Yes. P39.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can P39.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict P39.9 as a principal diagnosis.
Is P39.9 a CC or MCC?
- P39.9 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.